IANA tz database · zone identifier

Antarctica/McMurdo

The IANA tz database identifier for New Zealand Standard Time in Antarctica. Store this string — not the abbreviation, not the offset — and your timestamps stay correct forever.

UTC+12:00Abbreviation NZSTObserves daylight saving

Time in Antarctica/McMurdo☀ Daylight

11:01:08

Thursday, July 16, 2026

Offset

UTC+12:00

Abbreviation

NZST

DST

Observed

Current offset

UTC+12:00

standard UTC+12:00 · daylight UTC+13:00

Abbreviation

NZST

the standard-time form

DST behaviour

Observes

changes clocks twice a year

Country

🇦🇶 Antarctica

ISO 3166: AQ · view country page →

Using this identifier

The string to put in your code.

Antarctica/McMurdo is the identifier to use in code and config for this region. Every modern language, database, and OS resolves it through the same tz database, so the examples here behave identically everywhere.

Avoid storing NZST or +12:00 — abbreviations are ambiguous and fixed offsets can't follow rule changes.

// format a date in this zone

new Intl.DateTimeFormat('en-US', {

timeZone: 'Antarctica/McMurdo',

dateStyle: 'full', timeStyle: 'long'

}).format(new Date());

Offset & DST behaviour

Two offsets,
every year.

Antarctica/McMurdo alternates between NZST (UTC+12:00) and NZDT (UTC+13:00). Right now it is on NZST; clocks spring forward on 27 September 2026.

The year at a glance

Technical record

The database entry, in full.

source: IANA tz database

IdentifierAntarctica/McMurdo

ISO country codeAQ🇦🇶 Antarctica

Reference coordinates77.83°S, 166.60°Etz database reference point

Standard offsetUTC+12:00abbreviation NZST

Daylight offsetUTC+13:00abbreviation NZDT

Where it applies

One of Antarctica's 10 zones.

🇦🇶

Antarctica

5K people, 10 time zones — this identifier covers one of them.

Country page →

Related identifiers

Nearby in the database.

Same zone group · New Zealand Standard Time

other identifiers keeping NZST

Pacific/AucklandNew Zealand

Same offset · UTC+12:00

other zones keeping this offset right now

Pacific/FijiFiji · Fiji Standard Time Pacific/FunafutiTuvalu · Tuvalu Time Pacific/KwajaleinMarshall Islands · Marshall Islands Time Pacific/MajuroMarshall Islands · Marshall Islands Time Pacific/NauruNauru · Nauru Time Pacific/WakeUnited States Minor Outlying Islands · Wake Island Time

Frequently asked questions

Answers specific to this identifier — generated from the database record. Can't find what you need? Email [email protected].

What UTC offset is Antarctica/McMurdo?: Antarctica/McMurdo is currently UTC+12:00 (NZST). It alternates between UTC+12:00 in winter and UTC+13:00 in summer.
Does Antarctica/McMurdo observe daylight saving time?: Yes. Clocks spring forward at the next transition on 27 September 2026, as they do twice every year.
Which country uses Antarctica/McMurdo?: Antarctica. It is one of 10 IANA zones covering the country.
Is Antarctica/McMurdo the same as NZST?: Antarctica/McMurdo is one of the IANA zones that keeps New Zealand Standard Time (NZST). Use Antarctica/McMurdo in software — NZST is a human-friendly label, not a valid identifier.

Free · Developer API

This zone, as JSON.

Everything on this page — offset, abbreviation, DST rules, coordinates — from one endpoint, always current with the latest tzdb release.

GET /v1/timezones Live

countries, cities, convert, DST transitions coming next.

Get your free API key →

// this identifier, resolved live

GET /v1/timezones?iana=Antarctica/McMurdo

{

"iana": "Antarctica/McMurdo",

"utc_offset": "+12:00",

"abbreviation": "NZST",

"observes_dst": true,

"country": "AQ"

}